The power delay profile (PDP) gives the intensity of a signal received through a multipath channel as a function of time delay. The time delay is the difference in travel time between multipath arrivals. The abscissa is in units of time and the ordinate is usually in decibels. It is easily measured empirically and can be used to extract certain channels' parameters such as the delay spread.

over a local area.

References

2. 36521 section B2 http://www.3gpp.org/ftp/Specs/html-info/36521-1.htm